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Invert filter reticule

I have a working reticle, but I'd like to use it as an invert filter so that bits of the scene behind it are rendered with their colors inverted. This results in the reticle's visibility being consistent yet non-obstructive. Below is a demonstrative screenshot from Minecraft. Some players may not notice this, but I sure as hell do. And, I like it.

My current reticle is a GUITexture, but I can change it if doing so were to make this effect possible.